Link chain spanner wrench



May 6, 1947. s. M. GRAHAM LINK CHAIN SPANNER WRENCH INVENTOR. y 5m 7/2 52mm ao ,r fines-m Filed June. 19, 1944 Patented May 6, 1947 UNITED STATES PATENT OFFICE LINK CHAIN SPANNER WRENCH George Graham, Detroit, Mich, assignor to Hinckley-M-ycrs Division of. Kent-Moore rganization, Inc., Jackson, Mich., a corporation of Michigan Application June 19, 1944; Serial No. 540,940

3 Claims.

the member to exert rotating torque upon the member.

Another object is to provide a wrench of the character described having a pair of toggle arms pivotally articulated together and having nut engaging portions on their inner faces, and one of whicharms terminates in ahand lever, and including a chain pivoted to one arm and adapted to be releasably coupled. to the other arm to hold the arms against the nut.

A further object is to provide such a wrench of thespanner chain type provided with a part which isadapted tobe engaged within a notch or slot inv the periphery of the nut or member to be rotated and wherein the chain holds such part tightly engaged within the detent during the exertion of rotating'torque upon the nut but which wrench is capable of being quickly released from the nut.

Another object is to provide such a wrench which is of sturdy construction and adapted to be quickly attached to or released from engagement about a nut and which is of simple design.

A meritorious feature of the invention is that the wrench includes a pair of pivotally articulated toggle arms, one of which arms terminates at one end in a hand lever and is provided at the opposite end with a part or detent adapted tobe engaged in a notch of a nut or other rotatable member. A chain is pivoted at one end to such arm between the toggle pivot and the detent engaging end of the arm. The other arm is provided with means adapted to releasably engage successive links of the chain to loop the chain about the nut or member to be rotated. The chain is so pivoted to one arm and so engaged with the other arm as to hold both arms tightly against the nut in one direction of rotation to exert rotating torque upon the nut.

A further meritorious feature is that the arm to which the chain is releasably engaged is so shaped that when the hand lever is swung to release the grip of the wrench from the nut such arm fulcrums upon the nut and swings the chain outwardly therefrom to facilitate release of the wrench.

Further objects, advantages and meritorious features will more fully appear from the following description, appended claims and accompanying drawing wherein:

Figure 1 is a side elevation of my improved wrench secured in position about a packing. nut to rotate the same.

Figure 2 is a side elevation of my improved.

.- wrench secured about a packing nut .such as is shown in Figure 1 but with the wrench swung to release its grip upon the nut.

Figure 3 is a sectional view taken on the line 3-3- of Figure 2'.

Figure-4 is a view partly insection and partly inelevation taken on theline4-4 of Fi ure 2'.

Figure 5 isa fragmentary view showing a modificat'ion of the construction.

the drawings, a packing nut HI, provided with a series of notches or slots [2, four being here shown, is illustrated as encircling a shaft M The nut may be'in the form of an internally threaded cup-threaded upon a member notshown. Such nuts are well known in the industry and frequently have a circular. shape and are provided with slots 'or'notches to be engaged by a wrench for rotation.

My improved wrench comprisesapair of toggle arms 1:6 and 1-8 pivotally articulatedv together by. a pivot pin 20. The arm 16 is provided at one end with a hand lever 22. At the opposite end of the arm and projecting from its inner face is a lug or detent part 24 which is adapted to be received within a notch l2 of the nut. The inner face of such arm is cut away so as to present a somewhat concave shape to permit the arm to follow more or less th periphery of the nut.

A chain 26 formed of a succession of links as shown is pivoted at one end as at 28 to the arm IS in such a manner that the chain may overlie the outer face of the arm as shown in Figures 1 and 2 so as to hold the lug '24 within the notch I 2 of the nut.

The other arm I8 is provided upon its rear face with an outwardly projecting lug 36 adapted to be received within successive links of the chain as shown in Figures 1, 2 and 4 so as to hold the chain in the form of a loop about a nut. The inner face of such arm I8 is of an angular shape or what might be termed of a general convex shape so that such arm may rock upon the periphery of the nut as shown in Figure 2, the two angularly disposed portions of said arm being so relatively disposed that the greater angle is presented toward the nut when engaged thereabout, as shown in Fig. 1.

When the wrench is engaged about a nut with the chain connected as shown in Figures 1 and 2, and the hand lever of the wrench is moved in a counter clockwise direction, the chain holds the lug 24 firmly within the notch l2 and a torque is exerted upon the nut through the lug 24 acting upon the shoulder of the notch tending to rotate the nut. When the hand lever is moved in the opposite or clockwise direction as shown in Figure 2, the elbow 19 of the arm 18 rocks upon the periphery of the nut and the toggle expands and the chain is loosened about the nut so as to permit the revolution of the wrench thereabout to engage the lug 24 in another notch to obtain a new grip on the nut or so as to release the wrench from the nut and permit disconnection of the chain for complete release.

In Figure 5, the lug 24 of arm I8 is provided with serrations or teeth 25 and the elbow I9 of arm 18 is provided with teeth .25, which are adapted to bite into the periphery of a nut or other member to rotate such member when the arms are held against the nut by the chain 26. With this modification it is not necessary for this nut to be provided with notches or slots and the wrench can be used upon a nut having a plain circular periphery or can be used upon a pipe to exert rotating effort thereupon.

What I claim is:

, 1. A wrench comprising a pair of pivotally articulated toggle arms, one arm terminating at one end in a hand lever and provided at its opposite end with a nut engaging lug projecting from its inner face towards the other arm of the toggle, a chain pivoted at one end to said arm spaced between the lug and the toggle pivot and adapted to be extended over the outer face of the arm and about the nut, said chain being connected with the other arm, said other arm of the toggle consisting of two relatively angularly disposed portions the outer one of which is provided with an outwardly projecting part adapted to engage successive links of the chain, said two angularly disposed portions being so relatively disposed that the greater angle is presented toward the nut when engaged thereabout.

2. A wrench comprising a pair of pivotally articulated toggle arms, one arm terminating at one end in a hand lever and provided at its opposite end with a part projecting from its inner face towards the other arm of the toggle and adapted to engage within a notch of a nut, a chain pivoted at one end to said arm spaced between the notch engaging part and the toggle pivot and adapted to be extended over the outer face of the arm and about the nut to connect with the other arm, the other arm of the toggle provided with a part on its outer face adapted to engage successive links of the chain and having an inner face angularly shaped to rock upon a nut embraced by said chain.

3. A wrench comprising a pair of pivotally articulated toggle arms, one arm terminating at one end in a hand lever and provided at its opposite end with a serrated nut engaging part projecting inwardly from its inner face, a chain pivoted at one end to said arm spaced between said nut engaging part and the toggle pivot, the other arm of the toggle having an angularly shaped inner face the elbow of which is serrated to engage a nut, said arm provided on its outer face with a part adapted to releasably engage successive links of the chain, said chain being so pivoted to the first arm as to extend over the outer face thereof when the chain is coupled with the other arm of the toggle.

GEORGE M. GRAHAM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,084,483 Robbins Jan. 13, 1914 286,836 Liljencrautz Oct. 16, 1883 1,006,348 Beran Oct. 17, 1911 FOREIGN PATENTS Number Country Date 4,898 British Mar. 30, 1915 201,438 British Aug. 2, 1923 

